Jupiter 2013 December 10

I had a busy night; seeing was unusually good for this location. Ian Sharp reported exceptional seeing in Sussex as well, but Damian Peach, in a different part of Sussex, reported poor seeing, strangely.

First row are RGB composites. Second row are the same data but presented using an LRGB process, which gives more contrasty results, but worse artefacts. Third row are Infra-red images at 742nm, with Callisto just emerged from occultation in the second one.

In total, 24 one-minute videos were processed to give this set. Click twice for full-size.j2013-12-10_irgb_DLA

IC 5067 narrowband (part of the Pelican Nebula)

Here is an attempt at narrowband imaging with the 10″ f4.8 last night. The light frames total 115 minutes. The palette used is R and L = H alpha, G = 0III, B = SII. Almost all the nebula information is in the H alpha, there’s just a trace of SII emission and little trace of OIII, hence it’s basically red. Processing was in Nebulosity and Photoshop CS4 with Neat Image plugin. (Click to enlarge image)



The Sun (H alpha) 2013 August 31

Here’s my full disk from Saturday. Seeing was not that good.

There’s a lot of scattered light. This is due to the blocking filter. I’ve been finding that my Lunt blocking filters have gradually degraded over time, and are no longer transparent, but “crazed” on the surface of the larger glass component (the one towards the camera or eye). I wonder if anyone else has found this.


The Sun 2013 August 27

I managed to catch an astonishingly fast-moving prominence here. I imaged it for 1 minute runs at 5 minute intervals, but really this was too slow, it was changing so quickly, that shorter runs might have been better. It was moving visibly on screen, and 20 minutes after I first saw it it was dissipating into space. A rough calculation shows it was travelling of the order of 10,000 miles per minute, or 0.1% the speed of light. The frames are about 25% of the Sun’s diameter.


The Sun 2013 August 26

Here’s some images of a rapidly changing nearly-detached prominence on the Sun’s eastern limb.

Taken with at a focal length of 1440mm with a 100mm refractor, double-stacked with Lunt 50mm filters using home-built adaptor, plus 1.6x Barlow: a nice long optical train, as shown in the photo, with the system mounted on the C-14 in Stag Lane Observatory.